Ink is failing to form a continuous film.
Adjust ink to reduce viscosity. Use a more active (wetter) solvent.
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Stock is too rough.
Use electro-assist (with polar solvents).
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There are imperfections in the stock.
Adjust doctor blade to carry more ink. Use coating primer if possible.
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The ink is wrong for the substrate.
Reformulate or replace ink.
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Film treatment is poor.
Retreat or replace film.
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Worn cylinder, insufficient film transfer to cover substrate.
Remake cylinder.
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